Drill



- Patented Dec. 13, 1921.

J. B. AGASSIZ;

DRILL. APPLICATION FILED AER. 4, H321- UNITED STATES JAMES BURWELL AGASSIZ, OF HANA MAUI,

TERRITORY OF HAWAII.

DRILL.

Specification of Letters Patent.

Patented Dec. 13, 1921.

Application filed April 4, 1921. Serial No. 458,339.

To all whom may concern:

Be it known that 1, JAMES B. AeAssrz, a citizen of the United States, residing at Hana Maui, Territory of Hawaii, have invented certain new and useful Improvements in Drills, of which the following is a specification.

This invention relates to drills and more particularly to one designed for drilling holes in the bed of a stream or river in which to set concrete piles, posts, or other supporting means for bridges, wharves and other structures.

The primary object of the invention is to provide a drill adapted to operate in a tubular casing in such a manner that the dirt, detritus and other matter drilled loose from the earth can be quickly and efiiciently removed from the casing without choking or causing-the drill to bind or stick in the casmg.

Another object of the invention is to provide a drill adapted to be reciprocally operated in a tubular casing containing water, and so constructed that upon each reciprocation in the water it will coact with the water and produce an eflicient rotary cutting action.

Another object of the invention is to pro vide a tubular drill embodying a check valve at its upper end and a bit at its lower end, whereby on its downward movement the dirt and detritus as it is bored loose from the earth will pass upwardly through the drill, and upon its upward movement, the check valve will close and cause the material to be conveyed upwardly.

A still further object of the invention is to provide a drill of the above stated character embodying a removable bit having a plurality of cutting edges shaped and positioned so that the material after being severed from the earth will be guided inwardly aindlupwardly into the hollow body of the ril . A still further object of the invention is the embodiment of a drill bit consisting of a pairsof matched plates interpositioned and arranged at right angles to each other to provide a plurality of cutting edges, the cutting edges of each plate being arcuately curved to assist in guiding the disintegrated material inwardly and upwardly into the drill stock.

With these and other objects in view, the invention comprises the various other features of construction, combination and arrangement of parts as will more fully appear as the description proceeds.

Referring to the drawings:

Figure l is a sectional elevation of the drill in operative position within the drill casing,

Fig 2- is a vertical sectional view of the drill,

Fig. 3 is a sectional plan view taken on the line 33 of Fig. 1, and

Fig. 41 is a perspective view of the bit showing the blades separated. Referring more particularly to the drawing, the drill as shown is designed to be operated within a tubular casing 1, which is lowered through the water and forced into contact with the earth forming the bed of a stream, river, lake or the like as the case may be. A sufficient amount of water in which the drill is designed to be operated is allowed to remain in the casing 1, for a purpose which will presently appear.

The drill per se comprises a tubular body or bit stock 2, whichis comparatively heavy and is provided in its outer surface with spaced channels 3 disposed spirally and longitudinally throughout its length.

A check valve is mounted on the upper end of the tubular bit stock 2 and is intended to close the upper end of the bit stock on its upward movement within the drill casing. This valve consists of a flexible member 1 detachably connected to the end of the tubular stock 2 by fastening elements 5. A metallic plate 6 is secured upon the member l and serves as a weight to keep the valve normally closed.

A bail 7 is suitably connected to the upper end of the tubular stock 2 and has connected to it one end of a lifting cable 8.

The lower end of the tubular stock 2 is provided with pairs of diametrically opposed slots 9 and 10, the former being of less length than the latter and disposed at right angles to each other, The bit consists of complementary plates 11 and 12 interpositioned at right angles to each other so as to present a pluralitv of cutting edges. The plate 11 has a slot 13 the thickness of the plate extending in from its lower cutting edge to receive the lower body portion of the plate 12. The upper end of the plate 11 is bifurcated to provide arms 14 for position in the slots 9. The other plate 12 is also bifurcated at its upper end to provide arms 15 for position in the e 7 position. 10

slots 10 of the bit stock. A slot 16 of the thickness of theplate extends inwardly from the bottom of the bifurcation forming'the arms 15 and receives the body portion 17 of the other plate '11.

Fastening elements 18 are passed through the bit stock Q and the arms 1% and 15 of the bit plates to securely hold the latter in rigid It is of course to be understood that these elements can be removed when desired in order to remove the bit plates for sharpening or replacing.

It is to be further observed that the bifurcations in the upper ends of the bit plates 11 and 12 extend inwardly far enough so that when the bit plates are inter-locked in position, a space 19 is provided between their inner ends and the bottom of the bit stock whereby the disintegrated material as it is bored loose can freely pass upward into the bit stock.

The lower edge of each bit plate is a'rcuately curved as lndicated by the numeral 20 to assist in guiding the borings inwardly and upwardly into the bit stock.

The drill is designed to be operated by an ordinary pile driver derrick and donkey engine from the surface by a cable extending from the engine down to the drill. The drill is to be worked inside of a' casing of about the same diameter as the drill itself and with long heavy strokes.

In operation, the drill is raised and then allowed to drop whereby it will, by virtue of its weight and the spiral channels 3 co-acting with the water inthe casing 1, descend rapidly with a rotary movement into contact with the earth, thus producing an efficient cutting and boring action. On each downward stroke of the drill the water and borings of the previous stroke will freely pass upwardly through the bit stock, and on each upward movement of the drill, the

check valve 011 top of the bit stock will close, thus enabling the borings to be carried and forced upwardly in the drill casing to the surface. By virtue of this construction and operation, the drill can be efliciently and rapidly operated without becoming clogged or stuck in the drill casing.

What I claim as new is:

1. A drill comprising a hollow bit stock, a check valve on the upper end of said bit stock,

cutting edges, and a bail secured to the upper end of said bit stock.

2. A drill comprising a hollow bitstock having longitudinally and spirally'disposed channels in its outer surface, a check valve on the upper end of said bit stock, a bail attached to the upper end of said bit stock, and a bit attached to the lower end of said bit stock and embodying interpositioned complementary plates having arcuate cutting edges.

3. In a drill, a tubular bit stock having one end provided with pairs of diametrically opposed slots, a bit consisting of complementary plates interpositioned at right angles to each other, each plate being provided at one end with a bifurcation to provide arms, said arms adapted to be positioned in the said slots of the bit stock, and means passing through said arms and bit stock for holding the plates in position 4. In a drill, a tubular bit stock having one end provided with pairs of diametrically opposed slots,a bit consisting of complementary plates interpositioned at right angles to each other, each plate being bifur cated at one end to provide arms'adapted to be positioned in the slots of the bit stock, and means passing through said armsand bit stock for holding the plates in position,

the bifurcation of said plates extending in wardlv far enough to provide a passage between their inner ends and the end of the tubular bit stock. e

In testimony whereof I affix my signature.

JAMES BURWELL AGAHSSIZ.

a bit secured to the lower end of said bit stock embodying a plurality of arcuate 

